Bootstrap to extend WTF:RefPtr's run-time adoption checking to skia's SkRefCnt

Source/wtf/PassRefPtr.h

 /*
  *  Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Library General Public
  *  License as published by the Free Software Foundation; either
  *  version 2 of the License, or (at your option) any later version.
  *
  *  This library is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 15 matching lines @@
 #include "wtf/TypeTraits.h"
 
 namespace WTF {
 
     template<typename T> class RefPtr;
     template<typename T> class PassRefPtr;
     template<typename T> PassRefPtr<T> adoptRef(T*);
 
     inline void adopted(const void*) { }
 
+    // requireAdoption() is not overloaded for WTF::RefCounted, which has a
+    // built-in assumption that adoption is required. requireAdoption() is
+    // for bootstrapping alternate reference count classes that are compatible
+    // with ReftPtr/PassRefPtr but cannot have adoption checks enabled
+    // by default, such as skia's SkRefCnt. The purpose of requireAdoption()
+    // is to enable adoption checks only once it is known that the object will
+    // be used with RefPtr/PassRefPtr.
+    inline void requireAdoption(const void*) { }
+
     template<typename T> ALWAYS_INLINE void refIfNotNull(T* ptr)
     {
-        if (LIKELY(ptr != 0))
+        if (LIKELY(ptr != 0)) {
+            requireAdoption(ptr);
             ptr->ref();
+        }
     }
 
     template<typename T> ALWAYS_INLINE void derefIfNotNull(T* ptr)
     {
         if (LIKELY(ptr != 0))
             ptr->deref();
     }
 
     template<typename T> class PassRefPtr {
     public:
@@ skipping 119 matching lines @@
     }
 
 } // namespace WTF
 
 using WTF::PassRefPtr;
 using WTF::adoptRef;
 using WTF::static_pointer_cast;
 using WTF::const_pointer_cast;
 
 #endif // WTF_PassRefPtr_h